How do you evaluate #cos W = 0.6157#?
<W = 52° or 308°.
You are trying to find an angle which has a cos value of 0.6157.
This process is known as arc-cos and is shown on most calculators as
With angles from 0° to 360° there will be two angles which have a cos value of 0.6157.
The acute angle is
The other angle is